SF: Simplify setTransactionFlags

Merge overloads and remove unused return value.

Bug: 185535769
Test: Build
Change-Id: If2fe712614181e82bbe219775745a1ee7af2e210
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 1b8d0d5..cfe520e 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -3676,16 +3676,13 @@
     return mTransactionFlags.fetch_and(~mask) & mask;
 }
 
-uint32_t SurfaceFlinger::setTransactionFlags(uint32_t mask) {
-    return setTransactionFlags(mask, TransactionSchedule::Late);
-}
-
-uint32_t SurfaceFlinger::setTransactionFlags(uint32_t mask, TransactionSchedule schedule,
-                                             const sp<IBinder>& applyToken) {
-    const uint32_t old = mTransactionFlags.fetch_or(mask);
+void SurfaceFlinger::setTransactionFlags(uint32_t mask, TransactionSchedule schedule,
+                                         const sp<IBinder>& applyToken) {
     modulateVsync(&VsyncModulator::setTransactionSchedule, schedule, applyToken);
-    if ((old & mask) == 0) scheduleCommit(FrameHint::kActive);
-    return old;
+
+    if (const bool scheduled = mTransactionFlags.fetch_or(mask) & mask; !scheduled) {
+        scheduleCommit(FrameHint::kActive);
+    }
 }
 
 bool SurfaceFlinger::stopTransactionProcessing(
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index 55d0358..335a6fe 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -779,21 +779,15 @@
 
     uint32_t getTransactionFlags() const;
 
-    // Sets the masked bits, and returns the old flags.
-    uint32_t setTransactionFlags(uint32_t mask);
+    // Sets the masked bits, and schedules a commit if needed.
+    void setTransactionFlags(uint32_t mask, TransactionSchedule = TransactionSchedule::Late,
+                             const sp<IBinder>& applyToken = nullptr);
 
     // Clears and returns the masked bits.
     uint32_t clearTransactionFlags(uint32_t mask);
 
-    // Indicate SF should call doTraversal on layers, but don't trigger a wakeup! We use this cases
-    // where there are still pending transactions but we know they won't be ready until a frame
-    // arrives from a different layer. So we need to ensure we performTransaction from invalidate
-    // but there is no need to try and wake up immediately to do it. Rather we rely on
-    // onFrameAvailable or another layer update to wake us up.
-    void setTraversalNeeded();
-    uint32_t setTransactionFlags(uint32_t mask, TransactionSchedule,
-                                 const sp<IBinder>& applyToken = {});
     void commitOffscreenLayers();
+
     enum class TransactionReadiness {
         NotReady,
         NotReadyBarrier,